🏷️ Add NumValidator.coerce_{type} methods
#571
Merged
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A
#coerce_{type}method is added to NumValidator for every corresponding#ensure_{type}method, but usable with numeric string input. A simple Regexp is used to ensure they are in the simple decimal format, as allowed by the IMAP grammar. Other string formats (e.g:0xffffor0001) are not legal in IMAP grammar and are intentionally unsupported here.